<template>
    <div class="upload-file">
        <el-upload
            multiple
            :before-upload="handleBeforeUpload"
            :file-list="fileList"
            :limit="limit"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :show-file-list="false"
            class="upload-file-uploader"
            ref="fileUpload"
            :http-request="submitUploadImgUrl"
            :drag="isDrag"
        >
            <div v-if="isDrag">
                <el-icon class="el-icon--upload"><upload-filled /></el-icon>
                <div class="el-upload__text">
                    将文件拖拽到特定区域以进行上传或点击上传
                </div>
            </div>
            <!-- 上传按钮 -->
            <el-button type="primary" v-else>选取文件</el-button>
        </el-upload>
        <!-- 上传提示 -->
        <div class="el-upload__tip" v-if="showTip">
            请上传
            <template v-if="fileSize">
                大小不超过
                <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为
                <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
            </template>
            的文件
        </div>
        <!-- 文件列表 -->
        <transition-group
            class="upload-file-list el-upload-list el-upload-list--text"
            name="el-fade-in-linear"
            tag="ul"
        >
            <li
                :key="file.uid"
                class="el-upload-list__item ele-upload-list__item-content"
                v-for="(file, index) in fileList"
            >
                <el-link :href="`${file.url}`" :underline="false" target="_blank">
                    <span class="el-icon-document singe-line">{{ getFileName(file.name) }}</span>
                    
                </el-link>
                <div class="ele-upload-list__item-content-action">
                    <el-link :underline="false" type="primary"  v-copyText="file.url" v-copyText:callback="copyTextSuccess">复制链接</el-link>
                    <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
                </div>
            </li>
        </transition-group>
    </div>
</template>

<script setup>
import { uploadFile } from '@/api/api';
const emit = defineEmits(['update:modelValue','handleSuccess']);
const props = defineProps({
    modelValue: [String, Object, Array],
    // 数量限制
    limit: {
        type: Number,
        default: 5,
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => [],
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
    // 是否拖拽上传
    isDrag: {
        type: Boolean,
        default: false
    }
});

const { proxy } = getCurrentInstance();
const number = ref(0);
const uploadList = ref([]);
const fileList = ref([]);
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
    if (val) {
        let temp = 1;
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(',');
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
            if (typeof item === "string") {
                item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
        });
    } else {
        fileList.value = [];
        return [];
    }
}, { deep: true, immediate: true });

// 上传前校检格式和大小
function handleBeforeUpload (file) {
    // 校检文件类型
    if (props.fileType.length) {
        const fileName = file.name.split('.');
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
            proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
            return false;
        }
    }
    // 校检文件大小
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }
    proxy.$modal.loading("正在上传文件，请稍候...");
    emit("handleSuccess", file);
    number.value++;
    return true;
}

// 文件个数超出
function handleExceed () {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError (err) {
    proxy.$modal.msgError("上传文件失败");
}
// 上传成功回调
function submitUploadImgUrl (uploader) {
    let form = new FormData();
    form.append("file", uploader.file);
    uploadFile(form).then(res => {
        if (res.code === 200) {
            uploadList.value.push({ name: res.msg, url: res.msg });
            uploadedSuccessfully();
        } else {
            number.value--;
            proxy.$modal.closeLoading();
            proxy.$modal.msgError(res.msg);
            proxy.$refs.fileUpload.handleRemove(file);
            uploadedSuccessfully();
        }
    })
        .catch((val) => {
            proxy.$modal.closeLoading();
        });
    
}
// 删除文件
function handleDelete (index) {
    fileList.value.splice(index, 1);
    emit("update:modelValue", listToString(fileList.value));
}

// 上传结束处理
function uploadedSuccessfully () {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit("update:modelValue", listToString(fileList.value));
        proxy.$modal.closeLoading();
    }
}

// 获取文件名称
function getFileName (name) {
    // 如果是url那么取最后的名字 如果不是直接返回
    if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
    } else {
        return name;
    }
}

// 对象转成指定字符串分隔
function listToString (list, separator) {
    let strs = "";
    separator = separator || ",";
    for (let i in list) {
        if (list[i].url) {
            strs += list[i].url + separator;
        }
    }
    return strs != '' ? strs.substr(0, strs.length - 1) : '';
}
/** 复制成功 */
function copyTextSuccess() {
  proxy.$modal.msgSuccess("复制成功");
}

</script>

<style scoped lang="scss">
.upload-file-uploader {
    margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
}
.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
}
.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}
.singe-line {
    text-overflow: ellipsis;
    overflow: hidden;
    word-break: break-all;
    white-space: nowrap;
    max-width: 200px;
}

</style>
